Nancy, I'm sincerely sorry, but it's wrong to encourage regurgitation, this is a well known fact..If I may offer a little insight into this possible problem. As a further note, it is unhealthy to encourage you companion to regurgitate, it's both physically unhealthy and mentally harmful .This is a accepted fact by the majority avian behavioral specialists. One reason this is so wrong is because a Grey isn't human and mating is impossible.
Most parrots kept as companion animals are hatched in captivity and raised by hand. This close association with humans allows the birds to imprint on humans. Imprinting is a form of early learning that results in the bird identifying with a particular species.When humans imprint a parrot, the bird grows up almost thinking it is human. This confusion often results in a parrot pursuing a human as its mate when it reaches breeding age or sooner and a lot of breeding revolves around regurgitation.
Parrot couples exchange food via regurgitation as part of the courtship ritual before breeding. It is even rehearsed by pre-breeding age birds once they have formed bonds.Regurgitation plays an even more important role once the chicks come along. While the female broods, the male forages for food. About twice a day, sometimes more often, the male returns to the nest where he feeds the female by regurgitating the food he gathered on his foraging excursion. She keeps this food in her own crop and passes it on to the chicks in the nest over the course of the day.
When imprinted companion parrots reach breeding age, they often direct courtship displays, including regurgitation, to their human caregivers. The best way to avoid a regurgitation problem is to nip it in the bud. The first time you see your parrot bob his head, quickly disassociate yourself by setting him on a stand or back in his cage; do not tolerate even the smallest episode, no matter how innocent it may seem.If your bird already has acquired the habit of regurgitating, the next time it happens take note of the environment and what seems to trigger it so you can avoid putting him in that situation again.
Like many other parrot behaviors, regurgitating is self-reinforcing. If you let it happen once, especially in association with other breeding behavior, you encourage him to repeat it. On the other hand, if you link it with something negative, like putting him back in its cage, the behavior is likely to decrease.
Jay